Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db5679d1a6e3064…

MALICIOUS

PDF

56.4 KB Created: 2020-08-09 17:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d04ba601dbacd1498f80c21872308af3 SHA-1: f67cc339aff3c7d3f7aed6cc38c932bdea954544 SHA-256: 0db5679d1a6e306449d8e370aed6c0e2ed22ddbbefa72e1efeb3518747678b26
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=blackjack+chart+pdf'. The document body, though heavily obfuscated, also contains this URL and references to 'blackjack chart pdf', suggesting a lure. The presence of many Shopify links, while some are benign, indicates a link farm strategy. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=blackjack+chart+pdf
    • http://files.worldprayingcommunity.com/uploads/1/3/1/4/131408537/tududixifinija.pdf
    • http://files.coolanniestravels.com/uploads/1/3/0/9/130969300/pojumawobafiki_kosululoba.pdf
    • http://files.davidharriscollection.com/uploads/1/3/1/4/131408100/28014.pdf
    • http://files.achirohealth.com/uploads/1/3/1/4/131483344/bosanuzesosufixi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/8436/3416/files/absa_bank_charges_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5825/files/95232842064.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7588/files/zoligusidipabuwibavuru.pdf
    • https://cdn.shopify.com/s/files/1/0427/6181/4172/files/zigiralad.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0412/files/84635774937.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/strikethrough_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0434/3670/3900/files/fewanugezi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0504/1051/files/datitoxigitepewefufaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/5251/2918/files/79192990495.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/77428725414.pdf
    • https://cdn.shopify.com/s/files/1/0432/2105/7700/files/biwabixasulupizexododadaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/2186/7930/files/66185876941.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c17.bin
c8f6b99c81c5e4b562b3127d8686104ab4ea2e104f8d090580f031d087d67b2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C17 4660 bytes
font_01_sfnt_off00009c05.bin
cd7b5623e08fbaccdef90bdf64f727f8f3b275a5532745c04a2ea1008fd5f249		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C05 13512 bytes
font_02_sfnt_off0000c6c5.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C5 4324 bytes

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